题目内容
9．Don't forgetto turn（turn） off the light before you leave the room．分析 离开房间前别忘了关灯．
解答 答案：to turn．这里是说别忘了去关灯，关灯这件事还没有做，故用forget to do sth表示忘了去做某事，故答案是to turn．
点评 forget to do 忘记要去做某事．（未做） forget doing 忘记做过某事．（已做）
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